@ARTICLE{HR07, AUTHOR = {M.~Herrmann and J.~Rademacher}, TITLE = {Riemann problems in {FPU} chains}, pages = {1042801--1042802}, journal = {Proc. Appl. Math. Mech. (PAMM)}, volume = {7}, number = {1}, YEAR = {2007}, note = {proceedings of ICIAM 2007} }